Carrier for braiding machines



Dec. 11, 1934- M. KRISSIEP ET AL CARRIER FOR BRAIDING MACHINES OriginalFiled April 15, 1933 2 Sheets-Sheet 1 g g; w huh V H ..nl 11 vlu Ilium,

BY flermamus a Dec. 11, 1934. M. KRISSIEP ET AL 1,9311068 CARRIER FORBRAIDING MACHINES Original Filed April 15, 1955 2 Sheets-Sheet 2 1 ggaINVENTORS: W111i ssiqp 6. Hanna 1:,

BY 2 7% '7 ATTORN Patented Dec. 11, F334 sr'rs waists CARRIER F02,BRAIDING MACHINES Max Krissiep and Herman Staub, Wyomissing,

lPa.,

assignors to Textile Machine Works,

Wyomissing, Pa, a corporation of Pennsylvania Griginal application April15, 1933, Serial No. 666,282. Divided and this application May 8, 1934,Serial No. 724,486

10 Claims.

multiplicity of rotatable and variously movable yarn carriers generallyhave included tension means to more or less uniformly feed the yarn fromthe yarn spools or cops, such means being arranged to effect stopping ofthe machine upon breakage of the yarn or thread.

The tension exerted upon the yarn by the carriers has not always beenconstant, frequently manifesting considerable variation in differentworking positions in the same machine. This has resulted in a certainnon-uniformity of the braided product, as well as thread breakage, and

other failures, which it has generally been possible to remedy beforebecoming serious in View of the fact that the machines have rotated at acomparatively low speed.

In the case of high speed machines, however, additional problems areencountered, among which appears the desirability of eliminating as faras possible thread breakage, with consequent frequent stoppage of themach ne and entanglement of loose ends of yarn among the moving parts,and non-uniformity of the work due to irregularity of tensions in thebraid strands.

Accordingly, the present invention aims .to simplify and improve theconstruction of the braiding carriers and render them sensitiveandpositive in action, so that the yarn tensioning or take-up member ofthe braiding carrier will function accurately and uniformly incontrolling the yarn feeding rotation of the bobbin or yarn holder, thusadapting the latter particularly for the conditions met with in highspeed operation of the braiding machine, in addition to providingcarriers equally advantageous for use with low speed machines. Anotherobject in line with the foregoing is-to enable the braiding carrier toefiect quick stoppage of the machine whenever a yarn breakage may occur.

In the case of certain braided products, the yarn may be unwound from asingle carrier in a plurality of strands. When one strand or any numberless than the total number of strands breaks and the machine continuesin operation, defects in the braided product will almost surely occurbefore the trouble becomes apparent and can be corrected. Also, thebroken strand may become badly tangled among the rapidlymoving parts.has for one of its objects the provision of means to stop the braidingmachine practically immediately on the occurrence of a break of anystrand or strands in a plural strand yarn.

With these and other objects in View, which will become apparent fromthe following detailed,

description of the illustrative embodiments of the invention shown inthe accompanying drawings, the invention resides in the novel elementsof construction, mechanisms and combination of parts in cooperativerelationship, as hereinafter more particularly pointed out in theclaims.

In the accompanying drawings:

Figure 1 is a side view,in elevation, of one form of a braiding carrierhaving certain novel features of the present invent-ion incorporatedtherein.

Fig. 2 is a partial side View taken from the opposite side of Fig. 1 andshowing an elevation of the control levers in working tension position.

Fig. '3 is a view similar to Fig. 2 illustrating the control levers inidle tension position.

Fig. 4 is a transverse sectional view, partly broken away, taken on theline 4-4 of Fig. 1.

Fig. 5 is a side elevation illustrating a modified form of carrier forfeeding a plurality of strands simultaneously from a single yarn spoolor package.

Accordingly, the present invention also Fig. 6 is an end elevation ofthe strand control means for stopping a carrier, looking from theinside,certain of the parts being broken away to more clearly show others.

Fig. '7 is-a view similar to Fig. 5, showing the plural yarn-breakagestop-control in operation.

Fig. 8 is a transverse sectional view partly broken away and taken onthe line 8 8 of Fig. 5.

Fig. 9 is a view similar to Fig. 8 but taken on the line 99 of Fig. 7.

Fig. 10 is a'partial side view taken from the opposite side of Fig. '7.

Fig. 11 is a transverse sectional View through the thread guide upright,taken on the line 11-11 of Fig. 6, on a slightly enlarged scale.

A braiding carrier is usually provided with a body portion whereon theyarn supply is carried, generally upon a spool or bobbin, and a foot orguiding portion which cooperates with other parts of the braidingmachine.

Referring to the accompanying drawings, Fig. 1 represents one embodimentof the invention including a bobbin 1 upon which is mounted a yarn orstrand package 2. The lower formation or body portion in this instanceis of a construction adapted for a particular commercial type ofbraiding machine for which purpose the carrier includes a foot portioncomprising spaced plates 33, connected by a shuttle piece 3*, andincluding a downwardly extending pin 3 for engagement with the drivegears of the braiding machine.

Integral with the lower portion is an upright base member 4 upon whichis pivotally secured a bifurcated yarn tensioning or take-up controllever 5 and a pivoted locking pawl lever 6. A spindle 7 which extendsupwardly from the base member 4, receives the yarn or strand supply 2.Desirably, the yarn supply is carried upon the bobbin 1, which may be ofusual con struction, with downwardly extending circumferentiallyarranged spaced teeth or serrations 9 adapted for engagement with thelocking pawl 6 whereby the bobbin and yarn supply may be positively heldfrom rotary movement immediately after each feed of a certain length ofyarn strand until a further feeding is permitted by means of thetensioning lever 5 releasing the pawl 6 from the teeth of the bobbin 1.

The yarn tensioning lever 5 has the opposite ends of its two arms 5a and5b united by a tubular shaft 10 which is journaled in a bearing 11 onthe base member 4, and its front end is formed with a hook-shaped yarnguide 13. The arm 51) is provided with an intermediate eccentricprojection or cam surface 14, as shown in Fig. 2, arranged to coact witha projection or cam member 15 on the pawl 6 to cause the latter torotate on its pivot 16, thereby disengaging the pawl tooth or detent 8from contact with the bobbin teeth 9. This pawl action insures theproper feeding of a yarn in a taut condition and also pr vents slack oroverfeeding of the yarn. The lever 5 is raised to the yarn releasingposition, as shown in Figs. 1 and 2, by an increased tension of the yarnstrand caused by the braiding of the yarn on an article of manufacture(not shown). The tension of the yarn strand is maintained substantiallyconstant by a coil spring 18 mounted within the hollow shaft 10, theends of which are respectively hooked through an aperture 19 in one ofthe lever arms 5a or 5b, and the other end hooked through an aperture 20in an arm 21 of the pawl lever 6. The pawl lever is formed with a detentportion 8 at its end opposite to the cam portion 15. One end of thepivot 16 is secured at the mid-portion of the pawl lever 6; and the arm21 is rigidly secured to the opposite end of the pivot. The body of thepivot is journaled in a bearing 11a provided at the upper part of thebase 4. Thus a rocking motion is imparted to the pawl lever 6 during thesimilar but opposite directional movement of the lever 5.

A thread guide upright 24 is fixed to an extension 22 on the base 4 andhas one or more suitable yarn guide eyes 25 and 26 thereon. The yarnstrand 27 unwinds from the package 2 to pass through the guide eye 25,then extends downward and around the hook-guide 13 and upwardly throughthe eye 26 to the article of manufacture to which the yarn is fed duringthe braiding operation.

Fig. 2 illustrates the cam surface 14 on the lever arm 51) in theoperation of causing the cam follower 15 to rise, thereby oscillatingthe pawl lever 6 and disengaging the detent 8 from the bobbin teeth 9.The bobbin 1 and the yarn package held thereon are now free to rotateand release a length of yarn. The lever 5 immediately responds to thedecreased tension of the fed strand 27 by means of the common spring 18which simultaneously forces the lever hook 13 downward and the detent 8into engagement with a bobbin tooth 9.

Fig. 3 illustrates the positions occupied by the levers 5 and 6 when ayarn strand breaks. At the instant a thread becomes severed during operation, the pawl 6, by means of the detent 8 and through the action ofthe spring 18, looks the bobbin against further rotation or furtherunwinding of additional yarn. The lever 5 is at such time in its lowerextreme position so that the outwardly curved surface of the arm 5 willserve as an abutment to the usual braiding machine automatic stop motionlever.

Fig. 4 illustrates the biased relation of the lever 5 and the pawl 6 bymeans of the action of the common spring 18 and the opposed relation ofthe spring ends in the separate apertures 19 and 20. The cam surface 14acts as an eccentric cam member for the lever 6, so that, as the yarntension increases, the eccentric end 14 of the lever 5'cams the pawllever 6 by means of the lat ters cam follower or offset member 15. Thelength of the lever 5 further aifords a certain regulation of thetension on the strand 27 and maintains the same at a desired minimumdegree, due to the arcuate swing of the hook portion 13 which acts toalternately increase and decrease the leverage effect upon the spring 18as the tension of the latter alternately increases and decreases duringupward and downward travel of the cam. The yarn tension is thusequalized at difierent points in the swing of the arm and maintainedsubstantially constant during the swinging components of the arm beforeand after it engages the pawl lever 6.

Fig. 5 illustrates a modified form of a carrier 30 having a pawl 31 withan ofiset 32 formed at right angles to the detent portion 34 forcoaction with a plurality of pawl locking devices 33 pro-- vided inracks 35 on the upright 36, presently referred to in detail. Thebifurcated cam lever 3'? has a contour similar to the lever 5hereinbefore described; and a bobbin 38, with ratchet teeth 39, isprovided for functioning in the same manner as described for the bobbin1 of Fig. 1.

In the form shown in Fig. 5, the thread guide upright 36 is preferablycast integral with the base portion 41 and is in the form of a fiatstrip with a yarn guide eye 42 at its upper end. The base 41 is formedwith spaced plates 40, a shuttle piece 400: and pin 4022 similar tothe'corresponding parts 3, 3a and 3b of the form shown in Fig. 1.

A plurality of yarn strands 43 and 44 unwind simultaneously from thepackage 45. They are then divided into the single strands 43 and 44 sothat each strand will pass singly under the hooks 46 of the suspendedweights 33, then through separate eyes 47 at the mid-portion of theupright and downwardly together around the hook guide 48 on thebifurcated thread tension lever 3'7. The two strands then pass upwardlythrough the uppermost eye 42 and are grouped with threads from aplurality of carriers which are jointly worked into the desired articleof manufacture.

The locking means in this instance comprises a plurality of threadtension weight bodies 33 which are suspended from the individual strands43 and 44 of the yarn feeding package during the yarn feeding operation.Upper and lower racks 35, 35a and 351) are formed on the inner surfaceof the upright 36 in such manner that,

as certain of. the strands become severed during a feeding operation,one of the weight members 33 will be guided intolocking engagement withthe pawl lever 31, as shown in Figs. '7 and 9.

In Fig. 6, the automatic pawl locking members 33 are shown suspendedfrom the individual yarn strands. The yarn package and upper portion ofthe bobbin are here broken away for clarity. The locking members 33 arein this instance formed with hook shaped upper ends having long stems 49which overlap the intermediate rack member 35a in such manner that themembers 33 are guided and supported against vibration in all lateraldirections, as clearly seen in Fig. 11.

In Fig. 7, the yarn strands have been severed, thereby causing the pawllocking members 33 to be positioned between the pawl offset member 32and the inner surface of the thread guide upright 36. The threadtensioning lever 37 is here shown in released position.

The operatic-n of the plural feed thread carrier shown in Figs. 5 to 9,inclusive, is as follows: When one of the yarn strands breaks duringrotation of the carrier ina braiding machine, one

of the weights 33, which is suspended from the severed thread, willdescend and remain in a lowered position, as shown in Fig. 7, and thusbeing wedged between the pawl offset 32 and the upright post 36, therebylocking the pawl 31 against swin ing on its axis or pivot 50 uponactuation by 4 break, and release the remaining weight 33. The

thread tension lever 37 will then be free from the yarn and will drop toits lowermost position as indicated in Fig. '7, because of the action ofthe spring 51 in the hollow shaft 52. The lever 37 will then'stop thebraiding machine by engaging. and operating the stop-motion trip lever53, as shown at 56 in Fig. 9.

The spring 51 functions in a manner similar to that of the spring 18 ofFigs. 1 to 4. In this instance, however, the pawl lever 31 and thethread tension lever 37 are separately actuated by individual springs 51and 55 mounted about the piv otal axis of each lever. As seen in Fig.10, the spring 51 is positioned within the hollow shaft 52 of the threadtension lever 37. One end of the spring 51 is secured to a stationarypin 58, at a side of the shaft journal 59, and the other end is insertedin an aperture 60 onthe opposite arm of the tension lever 3'7, so thatthe lever 37 is ten-' sioned against the base member 41.

The pawl lever 31 is maintained in tension by the separate spring 55 onan extension of the pawl pivot 50 (see Figs. 8 and 9). One end of thespring 55 is stationed in a suitable aperture in the side of the pivotjournal 55'. The other end, as seen at 61, is secured to a flange 62provided on the pivot member 50 which latter is secured to the pawllever 31 for simultaneous rocking motion therewith.

Obviously, the invention is not limited to levers of the particularforms here disclosed. Also, spring operated devices may besatisfactorily substituted for the gravity actuated members 33.

Each of the modifications of the invention described and shown hereinincludes a spring pressed yarn tensioning lever arm and a spring pressedpawl lever, in which the coil spring portions are compactly arranged andsubstantially enclosed about the hollow shaft or pivot portions,

the springs being thereby kept out of the way of the flying yarn, withless likelihood of being affected by collection of lint or entanglementwith the threads. The tension of the springs may be readily altered whendesired by simply increasing or decreasing the number of turns or coilsbefore securing the ends in place in their respective apertures; and forfine adjustment purposes, a plurality of spaced apertures 19, 20, 55 or60, may be provided to receive the respective spring ends intension-altering relation.

Another advantage of the construction resides in the arrangement of thebifurcated lever arm and the oppositely acting, relatively short, awllever, with their yarn engaging and tooth engaging portions disposed atthe front of the yarn carrier, in compact order and their cam portionsintermediate their respective pivoted mountings. This arrangement alsoaiiords a very efiicient and uniform leverage between the coacting camportions of the arm and pawl, in which the pressure is applied evenlyand gradually during the upstroke of the yarn tensioning lever armwithout any jar or perceptible increase as the pawl is caused to releasethe toothed portion of the bobbin. The entire construction is simple andrugged and not likely to get out of order, and is easy to disassemble orreassemble whenever the same may be necessary.

Of course, the improvements specifically shown and described, by whichwe obtain the above results, can be changed and modified in various wayswithout departing from the scope of the invention herein disclosed andhereinafter claimed.

We claim:

1. In combination with a braiding carrier having a rotatable support fora yarn package; a rocking pawl and a lever for controlling the rotationof said package support and means operative to engage the pawl to lockthe same against rocking on its axis independently of the lever, toprevent rotation of said package, when a yarn strand breaks.

2. In combination, a braiding carrier having a rotatable bobbin forsupporting a yarn package comprised of a plurality of parallel woundstrands; rocking levers cooperatively associated with said bobbin tocontrol movement thereof and means responsive to breakage of any of thestrands independently of another to lock one of said levers to preventrotation of said bobbin.

3. In combination, a braiding carrier having a rotatable bobbin arrangedto support a yarn package composed of a plurality of parallel woundstrands, lever means cooperative with said bobbin to control themovement thereof, and locking means responsive to breakage of any of thestrands independently of another to prevent coaction of said levers forlocking said package against rotation.

4. In a braiding carrier, the combination of a base including afootpiece, a yarn carrying bobbin rotatably mounted on said base, saidbobbin provided with a toothed portion, a yarn tensioning lever armpivotally mounted on said base, a spring for tensioning said lever armagainst upward movement, a pawl lever pivotally mounted on said baseabove said lever arm, said pawl lever including a locking portionengageable with the toothed portion of said bobbin, and said lever-armand pawl-lever including cooperatively engageable portions between thepivot point and the free end of the yarn-tensioning lever whereby upwardtensioning movement of said arm swings said pawl away from said toothedportion to permit rotation of said bobbin, and means dependent on yarnbreakage for locking said pawl lever in its bobbin-rotation-preventingposition.

5. In a braiding carrier, the combination of a base including a footpiece, a plural thread yarncarrying bobbin rotatably mounted on saidbase, said bobbin provided with a toothed portion, a thread guideuprising from said base, said yarn extending through said guide, aspring pressed yarn tensioning lever arm and a spring pressed pawllever, both pivotally mounted on said base, said pawl lever beingarranged to engage the toothed portion of said bobbin, and said leverarmand pawl-lever including cooperatively engageable portions wherebytensioning movement of said arm swings said pawl away from said.

toothed portion to permit rotation of said bobbin,

and means coactive with said yarn whereby yarn breakage causes saidmeans to lock said pawl lever in its bobbin rotation preventingposition.

6. In a braiding carrier, the combination of a base including afootpiece, a plural thread yarncarrying bobbin rotatably mounted on saidbase, said bobbin provided with a toothed portion, a

thread guide uprising from said base, said yarn bodies arranged forsuspension by the threads of said yarn, and, upon breakage of said yarn,to fall to a position between said pawl lever and thread guide.

7. A carrier, for feeding a plurality of yarns in a braiding machine,comprising a base, package-supporting means rotatably mounted on thebase, means on the base for controlling movement of said supportingmeans, and means responsive to breakage of one of said yarnsirrespective of breakage of another of said yarns and including anelement for actuating a machine control member. r

8. A braiding carrier comprising a rotatable yarn-package support, meansincluding a pawl and a lever for controlling the rotation of thesupport, and means including an element responsive to breakage of theyarn for locking the pawl against movement independently of the lever.

59. A braiding carrier comprising a rotatable bobbin for supporting aparallel-strand package, means including a lever for controllingmovement of the bobbin, and means responsive to breakage of one of thestrands independently of another for preventing operation of the leverand locking the bobbin.

10. A braiding carrier comprising a base, a bobbin rotatably mounted onthe base and having teeth, a yarn-tensioning arm pivotally mounted onthe base, a spring for tensioning the arm against upward movement, apawl mounted on the base above the arm for locking cooperation with theteeth and cooperation with the arm between the pivot point and the freeend of the arm for movingthe pawl to unlock the teeth in response toupward tensioning movement of the arm, and means responsive to yarnbreakage for locking the. pawl in its tooth-locking position.

- MAX KRISSIEP.

HERMAN STAUB.

